If you are getting ready to sell I wouldn't do much other than paint the red wall. Someone is not more likely to buy your house because you have a certain backsplash. Let them decide what they want to do to make the kitchen theirs. They may just rip it out. Keep the walls neutral, the counters cleared off, with only a couple of larger colorful display pieces on them, and your personal stuff to a minimum so they can visualize their things in your space.